<!DOCTYPE html>
<html>
<head>
	<title></title>
	<style type="text/css">
	*{margin:0;padding:0;}
	ul{
		list-style: none;
		border:5px solid #ccc;
		overflow: hidden;
	}
	ul li{
		float:left;
		margin:10px;
		width: 100px;
		height: 100px;
		background: orange;
	}
	</style>
</head>
<body>

<ul>
	<li>1</li>
	<li>2</li>
	<li>3</li>
</ul>

<h1>这是h1</h1>

</body>
</html>